Steam-boiler



' (No Model.) 2 SheetsSheet 1.

A. B. BURNS & J. T. KETGHUM. STEAM BOILER eerZiBur/aa :Zims f iddizmzorgey '5,

(No Model.) 2 She etsSheet 2.

A. B. BURNS & J. T. KETOHUM.

STEAM BOILER.

No. 593,921. Patented Nov. 16, 1897.

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ALEXANDER B. BURNS AND JAMES T. KETOHUM, OF BAY,

' WISCONSIN.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 593,921, dated November16, 1897.

I Application filed March 17, 1897. Serial No. 627,951. (No model.)

To all whom it may concern- Be it known that we, ALEXANDER B. BURNS andJ AMES T. KETCHUM,GitiZenS of the United States, residing at Green Bay,in the county of Brown and State of Visconsin, have invented a new anduseful SteamJBoiler, of which the following is a specification.

This invention relates to steam-boilers and it has for its object toeffect certain new and useful improvements in boilers of that characterthat are designed for either power, steam, or hot-water heating;

To this end the main and primary object of the invention is to soconstruct a boiler of this type whereby all of the heating-surfaces willbe exposed to the direct contact of the fire and hot gases, therebyinsuring economy of fuel, and also providing a construction inwhich-every part of the heating-surfaces may be readily accessible andeasily cleaned.

W'ith these and other objects in view, which will readily appear as thenature of the invention is better understood, the same consists in thenovel construction, combination,

and arrangement of parts hereinafter more fully described, illustrated,and claimed.

In the drawings, Figure l is a perspective View of a boiler constructedin accordance with this invention. Fig. 2 is a vertical longitudinalsectional view thereof. Fig. 3 is a top plan View. Fig. 4 is a front endView of the boiler.

Referring to the accompanying drawings,

' 1 designates a suitable boiler-furnace having that the upper side ofthe front smaller shellsection 6 is substantially in a line with theupper side of the rear larger shell-section 5,

with the lower portion of the rear large section 5 projecting materiallybelow the lower side of the front smaller section 6, as clearlyillustrated in Figs. 1, 2, and 4 of the drawings.

The two sections 5 and 6 of the boiler are in direct'communication witheach other and are joined or united together by an intermediatecrescent-shaped head-plate 7, which is securely riveted to the adjacentend edges of the said shell-sections 5 and 6, and the boilerbody iscompleted by the front and rear headplates 8 and 9, respectively fittedto the front end of the shell-section 6 and to the rear end of the rearshell-section 5. The severalheadplates 7, 8, and 9 form the flue-sheetsof the boiler, and a series of long return-fines 10 extend the entirelength of the boiler 4 and are fitted at their opposite ends,respectively, in the endhead-plates or flue-sheets 8 and 9, and a seriesof shorter fire-fines 11 extend only the length of the rearshell-section 5 and are fitted at their ends, respectively, in the rearhead-plate 9 and the intermediate'crescentshaped head-plate 7, whichforms a connection between the adjacent ends of the separate sections ofthe boiler.

A smoke-box extension 12 is fitted tothe rear end of the boiler andincloses a space beyond the rear ends of all of the fines 10 and 11 toprovide for directing the fire and hot gases which escape out of therear ends of the fines 11 into the rear ends of the returnflues 10, aswill be readily understood by those skilled in the art.

The boiler-body being constructed as described, with both shells thereofona circle,

the strain is equal and no stay-bolts are required, and at this point itis to be noted that the front shell-section 6 of the boiler extends thefull length of the fire-box 3 and forms a crownsheet therefor, wherebythe entire lower side of the front small section of the boiler will besubjected to the direct action of the fire and hot gases, and the lowerfront end portion of the rear section 5, formed by the intermediatehead-plate '7, is disposed immediately above the grate-line at the rearside of the fire-box and forms the rear wall of said fire-box, so thatall of the fire and hot gases from the fire-box are compelled to passdirectly into the front ends of the short firefiues 11, and practicallyno heat whatever is lost, but passes directly inside of the boiler.

In connection with the front smaller shellsection 6 of the boiler isemployed a pair of header-pipes 13, arranged, respectively, at oppositesides of the grate 2, immediately above the grate-1i ne,and saidopposite headerpipes 13 have coupled thereto the lower ends of avertical series of circulating-pipes 14, arranged in separate series atopposite sides of the fire-box and forming the side walls of the saidfire-box. The series of vertical circulating pipes or tubes 14; at oneside of the firebox extend upward from their point of connection withone of the pipes 13 and are connected with one side of the shell-section0, as at 15, at a point about on a line with the top row of lines 10,while the circulating pipes or tubes 1% at the opposite side of thefire-box are connected at their upper ends, as at 16, with one side ofthe shell-section b at a point about on a line with the lower row offiues 10, whereby a continuouscirculation of water can be maintainedwithin the boiler and through the opposite sets or series of pipes ortubes 14., it being noted that said opposite sets of pipes or tubes 1;are directly adjacent to the lire-surface and are naturally subjected tothe direct in fluence of heat therefrom.

The opposite header-pipes 13 for the opposite sets of circulating pipesor tubes 14 are connected at their rear ends with a trans versebridge-wall pipe 17, which is arranged at the rear side of the grate 2,directly under the front lower side of the shell-section 5, to form thebridge-wall for the tire box or chamber, while at the same time toassist in heating up the water circulated therein, and the saidbridge-wall pipe 17 is suitably connected at its opposite ends with areturn-piping frame 18, having a connection 19 with the lower side ofthe large shell-section 5 and feed-pipe connections 30, as plainlyillustrated in the drawings.

The herein-described construction of boiler, in combination with theparticular piping described, provides alarge heatingarea exposeddirectly to the fire and therefore necessarily provides for a uniformand rapid heating of the water within the boiler and the pipes connectedtherewith,thereby rendering the boiler especially available for power,steam, or hotwater heating.

The smoke-box extension 12 may be providcd at one side with double doors13, and any changes in the form, proportion, and the minor details ofconstruction may be resorted to Without departing from the principle orsacrificing any of the advantages of this invention.

Having thus described the invention, what is claimed, and desired to besecured by Letters Patent, is

1. In a boiler, the combination with a f urnace and the fire-gratetherein; of the boiler proper essentially comprising separateshellseetions of different diameter and eccentrically disposed, and thefire-fines extending the entire length of the boiler and also throughthe lower part of the larger section, the smaller section of the boilerforming the crown-shect for the fire-box above the grate, and the lowerfront end portion of the large section forming the rear wall of thefire-boximmediatel y above the grate-line, a transverse bridge-Wall pipearranged directly under the front lower side of the largershell-section, and circulatingpi pc connections with said transversebridgewall pipe, substantially as set forth.

2. The combination with a boiler-furnace and the fire-grate therein; ofa boiler essentially comprising separate eecentrically-disposedshell-sections of different diam eter, and the fire-fines xtendin gthrough the entire length of the boiler, and also through the lower partof the large section, the smaller section of the boilerlyin g above thefire-grate, and the lower front end portion of the larger section beingdisposed at the rear side of the grate immediately above the grate-line,a transverse bridge-wall pipe arranged under the front lower side of thelarger shell-section, opposite header pipes connected with thebridge-wall pipe and arranged at opposite sides of the grate, areturn-piping frame connected with the bridge-wall pipe and with thelower side of the large shell-section, and opposite sets or series ofvertical circulatingpipes connected at their lower ends with saidheader-pipes and at their upper ends to opposite sides of the smallershell-section, respectively at points about on a line with the top andbottom rows of fines in such section, substantially as set forth.

In testimony that we claim the foregoing as our own we have heretoaflixcd our signatures in the presence of witnesses.

ALEXANDER I BURNS. JAMES T. KETCIIUM.

\Vitnesses:

CHARLES E. BURNS, HERBERT T. CAMM, WM. LARSEN.

